Hyperolius castaneus Ahl 1931

A medium-sized montane Hyperolius (males 22–26 mm, females 25–36 mm) from central Africa with a pattern in brown and green.Colour pattern very variable, but does not fall into a juvenile and a female phase. Dorsum brown to green, the green specimens often with diffuse darker rounded spots, the brown-backed specimens often with irregular black spots surrounded by bright green. A black canthal line always present. Some of the green-backed specimens have an irregular light lateral line. The brown-backed specimens have a very irregular black lateral line. Ventrum and feet yellow to reddish. Throat of males yellow. Pupil horizontal.This is a most variable form from the central highlands. It bears a close resemblance to H. lateralis in voice and habitat preference, and some specimens may be impossible to identify. H. lateralis generally occurs at lower altitudes.This account was taken from "Treefrogs of Africa" by Arne Schiøtz with kind permission from Edition Chimaira (http://www.chimaira.de/) publishers, Frankfurt am Main.

Abundant in swamps in forests of eastern R. D. Congo, Rwanda and western Uganda.

The call is a succession of screams with a frequency-intensity of 2500–3000 cps. Apart from being somewhat deeper the voice is very similar to that of H. lateralis.